Display Device Variable Frame Rate Luminance Compensation
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Solution Overview
Problem
Existing display devices experience image quality deterioration and luminance reduction when operating in high frame rate variable frame modes due to leakage currents and LED ON SLEW effects during variable blank periods.
Innovation Solution
A display device with a controller that adjusts the magnitude of the sensing initialization voltage based on the frame rate value when operating in a variable frame mode, thereby improving image quality by compensating for luminance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable frame mode is used to prevent tearing phenomenon, then frame synchronization is improved, but luminance is reduced and image quality deteriorates due to leakage current and LED ON SLEW effects
Solution Approach 1:
The patent applies preliminary action by performing sensing initialization before the display period in variable frame mode. The controller applies a sensing initialization voltage to the pixels during the blank period, which compensates for the luminance reduction caused by leakage current and LED ON SLEW effects. This preliminary initialization ensures that pixels are properly prepared before actual display, preventing image quality deterioration while maintaining the benefits of variable frame rate operation.
2Reliability
If high frame rate is used in variable frame mode, then tearing phenomenon is prevented, but image quality deteriorates due to extended blank period effects
Solution Approach 1:
The patent performs sensing initialization during the blank period before each frame is displayed. By applying the sensing initialization voltage in advance, the system prepares the pixels for the upcoming high frame rate display, compensating for the cumulative effects of extended blank periods. This ensures that even at high frame rates where blank periods are more frequent, image quality is maintained through proactive pixel state management.
Solution Approach 2:
The patent changes the parameter of sensing initialization voltage magnitude based on the frame rate value. When operating in variable frame mode, the controller adjusts the sensing initialization voltage to an appropriate magnitude that compensates for frame rate variations. This dynamic parameter adjustment ensures optimal image quality across different frame rates by adapting the initialization strength to the specific operating conditions.
3Manufacturing precision
If sensing initialization voltage magnitude is increased to compensate for luminance reduction, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent dynamically changes the sensing initialization voltage magnitude based on the frame rate value rather than using a fixed high voltage. The controller adjusts the voltage parameter to match the actual operating conditions - applying higher voltage only when frame rate variations cause significant luminance reduction, and reducing or omitting it when conditions are favorable. This selective parameter adjustment improves image quality only when necessary, minimizing unnecessary power consumption.
Solution Approach 2:
The patent applies sensing initialization voltage selectively rather than continuously at maximum strength. Instead of constantly applying high initialization voltage that would waste power, the system applies partial initialization action only when frame rate conditions warrant it. This partial action approach provides sufficient compensation for luminance reduction in critical scenarios while avoiding excessive power consumption during normal operation.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a data driver configured to provide data voltages to the pixels, and a gate driver configured to provide gate signals to the pixels. The display device also includes a controller configured to control the data driver and the gate driver, and to control the magnitude of a sensing initialization voltage applied to the pixels based on a frame rate value when operating in a variable frame mode.